The campaign of Neverwinter Nights had its mistakes, Shadows of Undrentide tries to solve these as good as possible and as a decent expansion should do. Most of the time that is the case. There is more variation in quests and it's just more amusing. You really have the feeling that there are multiple ways to solve a quest, the roleplaying aspect is really better because of this. Now you can also see what's in your henchman's inventory and put the heavy items in there so you don't need to carry them anymore. Still present though is the henchmen's weird AI. The non-playing characters are really well worked out and have a lot to say (same case with the henchmen which tell a lot more). The three new tilesets en the 16 new monsters also play a big part. Especially the tilesets (Winter, Desert and Ruïns) make the game better, although one can ask himself why these weren't already in the original game? Even now I would have appreciated more tilesets but apparently there wasn't enough time (and money) for. The new monsters are all nicely designed and match very well with the new tilesets.